Don't assume numpy/pandas is available in guess_param_types
#630
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Implementing the suggestion in #629 (comment), needs #629 to be merged first
guess_param_types
is actually not used at all across HoloViz and not documented. The PR that added this utility - #317 - says that it "has cropped up several times and has resulted in some level of code duplication" and points to HoloViews Streams.define classmethod which indeed could make use of this utility, since it's basically inlining a partial implementation of it.#317 provides more details about the usefulness of this utility, and on the conversions it doesn't yet support.